Malbork Castle located in the town of Malbork in northern Poland is the largest castle in the world in terms of surface area. It was one of the many such castles built by the Teutonic Knights and follows the design of an Ordensburg fortress. This type of Ordensburg fortress was used by various germanic holy orders during the middle ages and are commonly found in Poland, Latvia, Lithuania and Estonia.
Te construction of the Malbork Castle began back in 1275 and since 1309 it served as the capital and central headquarters for the Teutonic Order of Holy Mary in Jerusalem.The castle later fell into disuse and was only restored during the early 20th century. The Teutons built it so as to strengthen their control over the region and protect it from the frequent attacks coming from the pagan Prussians and Baltic tribes.